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CHEMICAL CARTOGRAPHY with APOGEE: METALLICITY DISTRIBUTION FUNCTIONS and the CHEMICAL STRUCTURE of the MILKY WAY DISK

Hayden, MR and Holtzman, JA and Bovy, J and Nidever, DL and Bird, JC and Weinberg, DH and Johnson, JA and Andrews, BH and Majewski, SR and García Pé Rez, AE and Hearty, FR and O'Connell, R and Skrutskie, M and Wilson, JC and Prieto, CA and García-Herńandez, DA and Zamora, O and Anders, F and Chiappini, C and Minchev, I and Steinmetz, M and Beers, TC and Bizyaev, D and Pan, K and Girardi, L and Cunha, K and Smith, V and Frinchaboy, P and Harding, P and Schneider, DP and Mészáros, S and Robin, AC and Schiavon, RP and Schultheis, M and Shetrone, M and Zasowski, G (2015) CHEMICAL CARTOGRAPHY with APOGEE: METALLICITY DISTRIBUTION FUNCTIONS and the CHEMICAL STRUCTURE of the MILKY WAY DISK. Astrophysical Journal, 808 (2). pp. 1-18. ISSN 0004-637X

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Abstract

Using a sample of 69,919 red giants from the SDSS-III/APOGEE Data Release 12, we measure the distribution of stars in the [/Fe] versus [Fe/H] plane and the metallicity distribution functions (MDFs) across an unprecedented volume of the Milky Way disk, with radius 3 < R < 15 kpc and height kpc. Stars in the inner disk (R < 5 kpc) lie along a single track in [/Fe] versus [Fe/H], starting with -enhanced, metal-poor stars and ending at [/Fe] ∼ 0 and [Fe/H] ∼ +0.4. At larger radii we find two distinct sequences in [/Fe] versus [Fe/H] space, with a roughly solar- sequence that spans a decade in metallicity and a high- sequence that merges with the low- sequence at super-solar [Fe/H]. The location of the high- sequence is nearly constant across the disk.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural)
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society
Date Deposited: 11 Jan 2016 10:30
Last Modified: 07 Sep 2017 13:02
DOI or Identification number: 10.1088/0004-637X/808/2/132
URI: http://researchonline.ljmu.ac.uk/id/eprint/2564

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